Protein Overnight Brownie Batter Oats Recipe

This healthy, creamy, delicious and dessert-like protein overnight brownie batter oats is super easy to make and perfect for breakfast, pre and post-workout snacks, or even dessert!

What is protein overnight brownie batter oats?

Think of overnight oats, but thicker, creamier and taste like cookie/cake/brownie batter. Bonus for it being sugar-free, high protein, vegan, gluten and nut-free. Try it out — it’s delicious!

Why should I make these overnight brownie batter oats?

  • vegan
  • gluten-free and nut-free
  • High protein
  • filling – you only need 1/4 cup of oats!
  • perfect for better gut health and hormone balance
  • Creamy, delicious, tastes like dessert

Ingredients & Substitutions

  • quick oats – the key to a smooth creamy texture (besides the milk). Quick oats make it more batter-y with some texture. Use gluten-free oats or regular rolled oats, and if you don’t have quick oats, traditional rolled oats work too.
  • protein powder — I use a scoop of vegan vanilla protein powder and a little bit of unflavoured pea protein powder to balance the sweetness out. Feel free to use other flavours or types of protein powder and adjust the amount you want to add. If you don’t have protein powder, nut and seed butter are always an option to add more protein, but you’ll have to dial back the liquid by about 1/4 cup
  • Chia seeds — to make the batter “grow” and expand the size. Chia seeds also add fibre and lots of nutrients too. Flaxseeds are always a good substitute
  • Milk & Water – any kind of milk. For high-cal and higher protein, substitute the water for milk. Makes the recipe extra creamy. The amount of milk varies depending on your oats and protein powder
  • Optional: spices (I used cinnamon, cardamom, ground ginger),
  • flavours (cocoa/matcha/coffee/acai powder, lemon zest, vanilla/mint/coconut extract, fruits, etc.)

Tips & Tricks for the best protein overnight brownie batter oats

  • Mix the dry ingredients well
  • Add a few fewer wet ingredients at first. Once it reaches a thick batter texture, add another tablespoon or two of milk. That’s because the mixture will thicken in the fridge
  • I recommend letting the batter sit in the fridge for at least 3 hours for the best results
  • and taste test!! Everyone has different preferences. Sweet tooths out there may want to add more sweetener, while people who love creamy textures may want to use higher fat-content milk and use oat flour instead of regular or quick oats

Q & A

How long can high protein overnight brownie batter keep in the fridge?

About one week if the batter is kept in an airtight container

Can I use all the water instead of milk?

Yes, but keep in mind that the batter will not be as creamy

Can I warm the high protein overnight brownie batter up?

Good question – I haven’t tried that yet. Please let me know how it came out if you tried it!

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Print Protein Overnight Brownie Batter Oats Recipe

Protein Overnight Brownie Batter Oats Recipe

This healthy, creamy, delicious and dessert-like protein overnight brownie batter is super easy to make and perfect for breakfast, pre and post workout snack, or even dessert!
5 from 1 vote
Prep Time 5 minutes
Resting time 8 hours
Total Time 8 hours 5 minutes
Course Breakfast, Dessert, Snack
Cuisine American, French
Servings 1
Calories 350 kcal


  • 1/4 cup quick oats , gluten free if necessary
  • 1/4-1/3 cup vanilla protein powder (or one scoop)
  • 1/2 tbsp chia seeds/flaxseeds
  • 3/4 cup milk , any kind
  • 1/4 cup water
  • 1 tbsp cocoa powder , or other flavours (see Ingredients Substitutions for ideas)
  • spices optional, used each 1/4 tsp of cinnamon, cardamom and ground ginger


  • In a medium size container, Mix all the dry ingredient together (oats, spices, seeds, protein powder, flavours)
  • Add 1/2 cup milk and 1/4 cup water and mix well. The texture should be very thick
  • add more milk to thin it out, one tablespoon at a time. The consistency should be like a pancake batter. As a rule of thumb, add another 2 tbsps. of milk after it reaches your desire consistency. Watch the video for reference
  • cover and refrigerate for at least 3 hours, preferably overnight. This recipe will be able to keep in the fridge for up to one week



depending on your oats and protein powder, you may need to adjust the number of wet ingredients
for more flavour ideas as well as substitutions, see “Ingredients and Substitutions”
The nutrition facts below are used large flake oats and 1% milk (that’s where the sugar comes from – lactose)
Keyword brownie, chia seed, chocolate, flaxseed, oats, overnight

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